Heart attack in males is being studied, using twins. For monozygotic twins, the

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Heart attack in males is being studied, using twins. For monozygotic twins, the concordance rate is 39%. and for dizygotic twins the concordance rate is 26%. This means that genetic factors are invoked in determining the occurrence of male heart attacks environmental factors are invoked in determining the occurrence of male hear attacks a and b it is impossible to tell from the data Multiple sclerosis (MS) is being studied in twins. In one study. 50 monozygotic twin pairs were identified in which at least one member of the pair has MS. In 17 of these twin pairs, the other member of the pair also has MS. What is the concordance rate for MS in monozygotic twins? 17% 33% 34% 66% In an adoption study, the role of genetic factors in obesity is being studied. Body-mass index (BMI) is being used as a measure of obesity. The research shows that adoptees (those who are adopted) with higher BMI generally have biological parents with higher BMI. but the adoptees d consistently have adoptive parents with higher BMI. This study shows genetic factors influence BMI genetic factors do not influence BMI it is impossible to tell, without doing twin studies A pregnant woman arrives in the clinic for a genetic test. Which of the following genetic tests would not be used to detect the presence of an abnormal number of chromosomes in the fetus of this woman? r a. preimplantation genetic diagnosis r b. chorionic villus sampling r c. amneocentesis r d. maternal blood screening test How many DNA molecules would be present after 10 rounds of PCR. from a sample originally containing just one molecule of DNA? a. 1 b. 10 c. 102 d. 1024 e. 10248

Explanation / Answer

1. a

2.c {34%= (17/50)*100}

3. some part of the qs is deleted. Although I think c should be correct.

4.a (performed prior to implantation; before fetus formation)

5. d (210=1024)

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